阅读说明：本技术 用于盾构隧道的柔性密封环及其施工方法 (Flexible sealing ring for shield tunnel and construction method thereof ) 是由 汪珂 王立新 高升 李储军 崔玉龙 白阳阳 郑飞 王伟 王博 贾少春 翁木生 于 2021-07-20 设计创作，主要内容包括：本发明涉及一种用于盾构隧道的柔性密封环及其施工方法,所述柔性密封环位于相邻两片盾构隧道扇形环之间的接缝处,包括外侧柔性的止水环和内侧刚性的千斤顶推力传递部；千斤顶推力传递部为轴向叠加的多层结构,轴向穿插载荷支撑棒并将两片扇形环连接。本发明通过在柔性密封件上施加预应力的方法保证密封件与管环间必要的挤压力,能够保证该结构良好的防水密封性能；该结构能保证管环间良好稳定的连接性能,即对于扇形环间伸缩和地基不均匀下沉能显示出优异的吸收性。(The invention relates to a flexible sealing ring for a shield tunnel and a construction method thereof, wherein the flexible sealing ring is positioned at a joint between two adjacent shield tunnel sector rings and comprises an outer flexible water stop ring and an inner rigid jack thrust transmission part; the jack thrust transmission part is of a multilayer structure which is axially overlapped, and the load supporting rods are axially inserted and the two fan-shaped rings are connected. The invention ensures the necessary extrusion force between the sealing element and the pipe ring by applying a prestress method on the flexible sealing element, and can ensure the good waterproof sealing performance of the structure; the structure can ensure good and stable connection performance between pipe rings, namely, the structure can show excellent absorption performance for the expansion and contraction between the fan-shaped rings and the uneven sinking of the foundation.)

1. A flexible sealing ring for shield tunnel, its characterized in that:

the flexible sealing ring (3) is positioned at a joint between two adjacent shield tunnel sector rings and comprises an outer flexible water stop ring (4) and an inner rigid jack thrust transfer part (5);

the jack thrust transfer part (5) is of an axially stacked multilayer structure, and the load support rods (7) are axially inserted and connected with the two fan-shaped rings.

2. The flexible seal ring for a shield tunnel of claim 1, wherein:

the jack thrust transfer section (5) includes a left support member (51 a), a partition plate (52), and a right support member (51 b), the left support member (51 a) being fixed to a side surface of the left sector ring (1), the right support member (51 b) being fixed to a side surface of the right sector ring (2), the partition plate (52) being interposed between the left support member (51 a) and the right support member (51 b).

3. The flexible seal ring for a shield tunnel of claim 2, wherein:

an axial screw hole (11) is preset in the side face of the left sector ring (1), a corresponding through hole is formed in the left supporting piece (51 a), and the left supporting piece (51 a) is fixed to the side face of the left sector ring (1) through a screw (6);

an axial screw hole (11) is preset on the side surface of the right sector ring (2), a corresponding through hole is formed in the right supporting piece (51 b), and the right supporting piece (51 b) is fixed to the side surface of the right sector ring (2) through a screw (6).

4. The flexible seal ring for a shield tunnel of claim 3, wherein:

the side of left sector ring (1) and the side of right sector ring (2) correspond and have preset accepting hole (12), correspond on jack thrust transmission portion (5) and be provided with inserted hole (50), during inserted hole (50) of jack thrust transmission portion (5) were interpenetrated in load support stick (7), both ends inserted accepting hole (12) of left sector ring (1) and right sector ring (2) respectively, realize the vertical concatenation of left sector ring (1) and right sector ring (2).

5. The flexible seal ring for a shield tunnel of claim 4, wherein:

the screw holes (11) and the accommodating holes (12) are arranged at intervals in the circumferential direction.

6. The flexible seal ring for a shield tunnel of claim 5, wherein:

the cross section of the water stop ring (4) is in a right trapezoid shape, the inner end of the water stop ring is an inclined plane, and the outer end of the jack thrust transmission part (5) corresponds to the inclined plane of the water stop ring (4) and is also an inclined plane.

7. The flexible seal ring for a shield tunnel of claim 6, wherein:

the water stop ring (4) is of an integral structure or a multi-piece structure spliced annularly.

8. The flexible seal ring for a shield tunnel of claim 7, wherein:

each layer of the jack thrust transmission part (5) is of an integral structure or a multi-piece structure which is spliced annularly.

9. The construction method of the flexible sealing ring for the shield tunnel according to claim 8, wherein:

the method comprises the following steps:

the method comprises the following steps: a left support member (51 a) constituting a jack thrust transmission part (5) is arranged on the side surface (1 a) of the existing sector ring, and a screw (6) is inserted into the screw hole (11) to be fastened; then, inserting the load support rod (7) into an insertion hole (50) which is preset on the jack thrust transmission part (5) and an accommodating hole (12) on the side surface (1 a) of the fan-shaped ring; thereafter, the entire jack thrust transfer section (5) including the other right support piece (51 b) and the spacer plate (52) can be held on the left sector ring side face (1 a);

step two: arranging a water stop ring (4) on an inclined surface at the outer side of a jack thrust transmission part (5), then constructing a new right fan-shaped ring (2), and placing the other end of a load support rod (7) in an accommodating hole (12) of the right fan-shaped ring (2), wherein the constructed flexible sealing ring (3) achieves the condition of bearing the jack thrust;

step three: the shield machine jack is pushed, the water stop ring (4) deforms and extends towards the outer side of the sector ring under the compression, and the position of a thrust transmission part (5) of the jack is basically unchanged.

10. The construction method of the flexible sealing ring for the shield tunnel according to claim 9, wherein:

after the jack thrust is no longer transmitted, the spacer plate (52) is removed from between the left support member (51 a) and the right support member (51 b).

Technical Field

The invention relates to the technical field of shield tunnel construction, in particular to a flexible sealing ring for a shield tunnel and a construction method thereof.

Background

The shield method is a fully mechanical construction method for underground tunnel construction, and is a mainstream construction method for constructing urban subways and underwater tunnels at present. The shield segment is a permanent lining structure in the tunnel, and the segment quality and segment assembling construction quality directly influence the waterproof performance and durability of the tunnel lining structure, so that the overall quality and safety of the tunnel are determined.

Segment assembly is an important link for constructing a tunnel lining structure. After the soil body is pushed once, the precast concrete segments need to be spliced into a ring, at the moment, seams are formed between adjacent segments and between adjacent rings, and therefore the seams need to be sealed by adopting waterproof sealing parts. The common treatment method is that a groove is reserved at a joint of the duct pieces in advance when the concrete duct pieces are manufactured, then a matched waterproof sealing element is placed in the groove at the joint when the duct pieces are assembled, and the waterproof sealing structure is fixed at the joint position by means of the acting internal force between the duct pieces. To a general extent, the waterproof sealing structure can effectively guarantee the waterproof performance of the shield tunnel, but the internal force born by the segment is not uniform and stable, for example, when the segment structure is staggered due to foundation settlement, the segment joint can generate relative displacement, the waterproof sealing part can be subjected to huge shearing force, and the waterproof sealing structure can be easily damaged after the waterproof sealing part is continuously removed. For example when the section of jurisdiction structure takes place to warp again, the joint outside between the section of jurisdiction can open certain angle, leads to the extrusion force of effect on waterproof sealing spare to reduce, in case joint department forms the gap, waterproof performance between the section of jurisdiction will show the reduction. In addition, various groove designs on the duct piece can increase the process complexity of the prefabricated duct piece, the concave structure also influences the reinforcement ratio of the duct piece, and finally influences the overall rigidity and stress complexity of the tunnel lining structure.

Therefore, for the current duct piece leakage prevention technology and the defects of assembling quality, the waterproof sealing structure for the joint of the tunnel duct piece still needs to be improved and optimized.

Disclosure of Invention

The invention aims to provide a flexible sealing ring for a shield tunnel and a construction method thereof, which overcome the defects in the existing duct piece anti-leakage technology, solve the sealing problem of the duct piece at the longitudinal joint, have a ring joint with good waterproof sealing performance, and exert the functions of waterproof sealing and serving as a flexible joint while adapting to the shield tunnel construction process.

The technical scheme adopted by the invention is as follows:

a flexible sealing ring for shield tunnel, its characterized in that:

the flexible sealing ring is positioned at a joint between two adjacent shield tunnel sector rings and comprises an outer flexible water stop ring and an inner rigid jack thrust transmission part;

the jack thrust transmission part is of a multilayer structure which is axially overlapped, and the load supporting rods are axially inserted and the two fan-shaped rings are connected.

The jack thrust transfer portion comprises a left supporting piece, a spacing plate and a right supporting piece, the left supporting piece is fixed to the side face of the left sector-shaped ring, the right supporting piece is fixed to the side face of the right sector-shaped ring, and the spacing plate is clamped between the left supporting piece and the right supporting piece.

The side surface of the left sector ring is preset with an axial screw hole, a corresponding through hole is formed in the left supporting piece, and the left supporting piece is fixed to the side surface of the left sector ring through a screw;

the side of the right sector ring is preset with an axial screw hole, the right support piece is provided with a corresponding through hole, and the right support piece is fixed to the side of the right sector ring through a screw.

The side of left sector ring and the side of right sector ring correspond and have preset the accepting hole, correspond on the jack thrust transmission portion and be provided with the through-hole, during the through-hole of jack thrust transmission portion was alternated to the load support rod, the accepting hole of left sector ring and right sector ring was inserted respectively at both ends, realized the vertical concatenation of left sector ring and right sector ring.

The screw holes and the accommodating holes are annularly arranged at intervals.

The cross section of the water stop ring is in a right trapezoid shape, the inner end of the water stop ring is an inclined plane, and the outer end of the thrust transmission part of the jack corresponds to the inclined plane of the water stop ring and is also an inclined plane.

The water stop ring is of an integral structure or a multi-piece structure spliced annularly.

Each layer of the thrust transmission part of the jack is of an integral structure or a multi-piece structure which is spliced annularly.

The construction method of the flexible sealing ring for the shield tunnel is characterized in that:

the method comprises the following steps:

the method comprises the following steps: arranging a left support member constituting a thrust transmission part of the jack on the side surface of the existing sector ring, and fastening the left support member by inserting a screw into the screw hole; then, inserting the load support rod into the accommodating holes which are arranged in advance on the insertion hole of the jack thrust transmission part and the side surface of the fan-shaped ring; thereafter, the entire jack thrust transfer portion including the other right support member and the partition plate may be held on the left sector ring side;

step two: arranging a water stop ring on an inclined surface at the outer side of a thrust transmission part of the jack, then constructing a new right sector ring, and placing the other end of the load support rod in a containing hole of the right sector ring, wherein the constructed flexible sealing ring reaches the condition of bearing the pushing force of the jack;

step three: the shield machine jack is pushed, the water stop ring is compressed to deform and extend towards the outer side of the sector ring, and the position of the thrust transmission part of the jack is basically unchanged.

After the pushing force of the jack is not transmitted, the spacing plate is removed from the space between the left support piece and the right support piece.

The invention has the following advantages:

1. the invention ensures the necessary extrusion force between the sealing element and the pipe ring by applying a prestress method on the flexible sealing element, and can ensure the good waterproof sealing performance of the structure.

2. The structure can ensure good and stable connection performance between pipe rings, namely, the structure can show excellent absorption performance for the expansion and contraction between the fan-shaped rings and the uneven sinking of the foundation.

Drawings

FIG. 1 shows a schematic view of an embodiment of a flexible seal when pushed by a jack;

FIG. 2 is a schematic view of an embodiment of a flexible seal after being pushed by a jack;

FIG. 3 is a sectional view of a first stage of the mounting process shown in FIG. 1 at the section arrow A;

FIG. 4 is a sectional view of a first stage of the mounting process at the section arrow B in FIG. 1;

FIG. 5 is a sectional view of a second stage of the mounting process shown in FIG. 1, taken along the arrows of section A;

FIG. 6 is a sectional view of a second stage of the mounting process shown in FIG. 1 at the section indicated by the arrow B;

FIG. 7 is a view showing the effect of the installation at the arrow of section A after the jack is pushed;

fig. 8 is a view showing the effect of the installation at the section arrow B after the jack is pushed.

In the figure: 1. a left sector ring; 1a, a left fan-shaped ring side surface; 2. a right sector ring; 2a, a right sector ring side surface; 3. a flexible sealing ring; 4. a water stop ring; 5. a jack thrust transfer part; 6. a screw; 7. a load support bar; 11. screw holes; 12. an accommodating hole; 50. inserting through holes; 51a, a left support; 51b, a right support; 52. a partition plate.

Detailed Description

The present invention will be described in detail with reference to specific embodiments.

The invention relates to a flexible sealing ring for a shield tunnel, wherein the flexible sealing ring 3 is positioned at a joint between two adjacent shield tunnel sector rings and comprises an outer flexible water stop ring 4 and an inner rigid jack thrust transmission part 5; the jack thrust transmission part 5 is of an axially overlapped multilayer structure, and the load support rod 7 is axially inserted and connects the two fan-shaped rings.

The jack thrust transfer portion 5 includes a left support piece 51a, a partition plate 52, and a right support piece 51b, the left support piece 51a being fixed to a side face of the left sector ring 1, the right support piece 51b being fixed to a side face of the right sector ring 2, the partition plate 52 being interposed between the left support piece 51a and the right support piece 51 b. An axial screw hole 11 is preset on the side surface of the left sector ring 1, a corresponding through hole is arranged on the left supporting piece 51a, and the left supporting piece 51a is fixed on the side surface of the left sector ring 1 through a screw 6; the side of the right sector ring 2 is predisposed with an axial screw hole 11, the right support 51b is provided with a corresponding through hole, the right support 51b is fixed to the side of the right sector ring 2 by means of a screw 6.

Accommodating holes 12 are correspondingly formed in the side face of the left sector ring 1 and the side face of the right sector ring 2 in advance, insertion holes 50 are correspondingly formed in the jack thrust transmission part 5, the load support rod 7 is inserted into the insertion holes 50 of the jack thrust transmission part 5, the two ends of the load support rod are respectively inserted into the accommodating holes 12 of the left sector ring 1 and the right sector ring 2, and the left sector ring 1 and the right sector ring 2 are longitudinally spliced.

The screw holes 11 and the receiving holes 12 are circumferentially spaced apart.

The cross section of the water stop ring 4 is in a right trapezoid shape, the inner end of the water stop ring is an inclined plane, and the outer end of the jack thrust transmission part 5 corresponds to the inclined plane of the water stop ring 4 and is also an inclined plane.

The water stop ring 4 is of an integral structure or a multi-piece structure spliced annularly. Each layer of the jack thrust transmission part 5 is of an integral structure or a multi-piece structure which is annularly spliced.

The construction method of the flexible sealing ring for the shield tunnel comprises the following steps:

the method comprises the following steps: a left support member 51a constituting a jack thrust transmission part 5 is provided on the existing sector ring side surface 1a, and is fastened by inserting a screw 6 into the screw hole 11; next, inserting the load support rod 7 into the receiving hole 12 provided in advance in the insertion hole 50 of the jack thrust transmission portion 5 and the sector ring side surface 1 a; thereafter, the entire jack thrust-transmitting portion 5 including the other right support piece 51b and the partition plate 52 can be held on the left sector ring side face 1 a;

step two: arranging a water stop ring 4 on an inclined surface at the outer side of a jack thrust transmission part 5, then constructing a new right sector ring 2, and placing the other end of a load support rod 7 in an accommodating hole 12 of the right sector ring 2, wherein the constructed flexible sealing ring 3 reaches the condition of bearing the jack thrust;

step three: the jack of the shield machine is pushed, the water stop ring 4 deforms and extends towards the outer side of the sector ring under the compression, and the position of the thrust transmission part 5 of the jack is basically unchanged.

After the jack thrust is no longer transmitted, the spacer plate 52 is removed from between the left support 51a and the right support 51 b.

As shown in the attached drawings, the flexible sealing ring 3 of the present invention mainly comprises a water stop ring 4 and a jack thrust transmission part 5, and is installed between a pair of sector rings of the shield tunnel. The flexible seal ring 3 functions as a shield tunnel thrust receiving member when the jack pushes and presses, and when the jack thrust is not transmitted, the flexible seal ring starts to function as a tunnel waterproof seal member and also functions as a support structure of the waterproof seal member.

The water stop ring 4 is compressed and held between the pair of sector rings and is close to the outer peripheral side of the sector rings, is made of an elastic waterproof material, and mainly has a waterproof sealing function for a tunnel lining structure.

The jack thrust transfer part 5 is fixedly installed on the inner peripheral side of the sector ring and is in direct contact with the water stop ring 4, the jack thrust transfer part is composed of supporting pieces on two sides and a partition plate 52 in the middle, the left supporting piece 51a is fixed on the left sector ring side surface 1a, the right supporting piece 51b is fixed on the right sector ring side surface 2a, and the partition plate 52 is arranged between the two supporting pieces. The jack thrust force transmission portion 5 is held by a screw 6 inserted into a receiving hole 11 in a side surface of the sector ring and a load support rod 7 bridged between the pair of sector rings.

The cross section of the water stop ring 4 is in a right trapezoid shape, and a certain inclination angle is formed between the contact surface of the water stop ring and the thrust transmission part 5 of the jack and the horizontal structural surface of the component.

The characteristics of the support member are not particularly limited, but a member having sufficient rigidity is preferable because it functions as a receiving material when an impact thrust is applied to the flexible seal ring, and after the jack thrust is not applied, it reacts with the load from the ground together with the load support rod 7.

The water stop ring 4 is a member continuous in the circumferential direction of the sector ring, and since the water stop ring 4 is a member made of an elastic body such as rubber, it can be carried into a construction site by folding or the like, but when the water stop ring 4 is folded and becomes large and cannot be carried in, it may be divided into a plurality of portions in the circumferential direction of the sector ring. In this case, after the water stop ring 4 is constructed, it is necessary to perform an adhesion treatment or a vulcanization adhesion treatment on site, or perform a water stop treatment using, for example, water-swellable rubber at the joint.

The cross-sectional shape of the spacer plate 52 is a wedge that breaks at the receiving hole to facilitate further removal. In addition, the spacer plate 52 is selected to exhibit sufficient resistance to the jack thrust and to be easily removed from between the pair of support plates after the jack thrust is not transmitted, such as a thermoplastic resin material.

The receiving holes 12 provided on the side surfaces constituting the sector rings may be previously provided at the time of manufacturing the sector rings, or may be directly formed on the side surfaces of the sector rings at the construction site, and the receiving holes 12 may be used together with the insertion holes 50 to fix the jack thrust-transferring portions 5.

The construction method of the invention can install the sealing ring between the sector rings by a simple method, can realize good and stable waterproof sealing effect, and can provide excellent absorbability for expansion and contraction between the sector rings and ground settlement, thereby preventing the damage of a tunnel lining structure.

The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.